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One example of how this can be used is to restore an object to its previous state (undo via rollback), another is versioning, another is custom serialization. The memento pattern is implemented with three objects: the originator, a caretaker and a memento. The originator is some object that has an internal state.
A snapshot is a read-only point-in-time copy of the volume. Snapshots allow the creation of consistent backups of a volume, ensuring that the contents do not change and are not locked while the backup is being made. The core component of shadow copy is the Volume Shadow Copy service, which
This may include a snapshot of the data files plus a snapshotted log of changes made while the backup is running. Upon a restore, the changes in the log files are applied to bring the copy of the database up to the point in time at which the initial backup ended. [56]
For example, snapshots ["near-CDP" clarification in the section below] can provide a reasonable near-CDP-level of protection for file shares, letting users directly access data on the file share at regular intervals—say, every half hour or 15 minutes. That's certainly a higher level of protection than tape-based or disk-based nightly backups ...
SQL refers to Structured Query Language, a kind of language used to access, update and manipulate database. In SQL, ROLLBACK is a command that causes all data changes since the last START TRANSACTION or BEGIN to be discarded by the relational database management systems (RDBMS), so that the state of the data is "rolled back" to the way it was before those changes were made.
One of the original and now most common means of application checkpointing was a "save state" feature in interactive applications, in which the user of the application could save the state of all variables and other data and either continue working or exit the application and restart the application and restore the saved state at a later time.
SnapRestore is a licensed feature, used for reverting active file system of a FlexVol to a previously created snapshot for that FlexVol with restoring metadata inodes in to active file system. SnapRestore is used also for a single file restore or LUN restore from a previously created snapshot for the FlexVol where that object located.
macOS ships with the command-line bzip2 tool. GNU/Linux. Most GNU/Linux distributions ship with the command-line bzip2 tool. Berkeley Software Distribution (BSD) Some BSD systems ship with the command-line bzip2 tool as part of the operating system. Others, such as OpenBSD, provide it as a package which must first be installed. Notes